Javascript Byte to hex

byteToHex.js

var hexChar = ["0", "1", "2", "3", "4", "5", "6", "7","8", "9", "A", "B", "C", "D", "E", "F"];

function byteToHex(b) {
  return hexChar[(b >> 4) & 0x0f] + hexChar[b & 0x0f];
}

It looks like ES6 has a handy way of achieving the same thing:

(yournumber).toString(16)

example:

(255).toString(16); "ff"

https://2ality.com/2015/04/numbers-math-es6.html#new-integer-literals